WO2019096284A1

WO2019096284A1 - Method for reporting layer information, and terminal

Info

Publication number: WO2019096284A1
Application number: PCT/CN2018/116062
Authority: WO
Inventors: 徐明慧; 张希; 秦熠
Original assignee: 华为技术有限公司
Priority date: 2017-11-17
Filing date: 2018-11-17
Publication date: 2019-05-23
Also published as: CN109802791A; CN109802791B

Abstract

Provided is a method for reporting layer information. In the method, a bit string obtained by joint encoding is used to indicate ACK/NACK information and layer information, which can save on the number of bits required for respectively indicating ACK/NACK information and layer information, thus reducing overheads. In addition, triggering reporting by means of reporting conditions can greatly reduce the frequency of reporting, thus reducing unnecessary reporting, reducing reporting overheads and reducing the waste of resources. By limiting the number of elements in a set of layers that can be reported, the number of bits required for reporting one layer can be reduced, thus reducing overheads.

Description

Method and terminal for reporting layer information

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a terminal for reporting layer information.

Background technique

In existing communication systems such as 2G, 3G and LTE systems, the operating frequency bands of communication systems are all in the frequency range below 3 GHz, and the available working frequency bands are less and less in this frequency range, which cannot meet the growing communication. demand. In contrast, the frequency range above 3 GHz has a large number of underutilized frequency bands. Therefore, the industry is researching and developing next-generation communication systems such as 5G systems with operating bands above 3 GHz to provide ultra-high-speed data communication services. For example, in the frequency range above 3 GHz, the frequency bands available for the next generation communication system include those located at 28 GHz, 39 GHz, 60 GHz, 73 GHz, and the like. Because its operating frequency band is above 3 GHz, the next generation communication system has the remarkable features of high frequency communication system, such as its wide working bandwidth and its use of highly integrated antenna array, which makes it easy to achieve high throughput.

However, relative to existing communication systems, phase noise (PHN), Doppler effect, and center frequency offset (CFO) introduce phase errors into the data reception of high-frequency communication systems, resulting in high The performance of the frequency communication system has dropped or even failed to work.

Therefore, next-generation communication systems operating in the frequency band above 3 GHz will suffer from more severe medium-frequency distortion. Especially the impact of phase noise on it. In addition, the Doppler effect and CFO's impact on the performance of next-generation communication systems operating in the 3 GHz band will also increase as the location of the operating band becomes higher.

Summary of the invention

The embodiment of the present application provides a method for reporting layer information and a terminal, which can reduce reporting overhead and reduce resource waste.

In a first aspect, an embodiment of the present application provides a terminal, where the terminal is used to report layer information. The terminal includes: a generating module, configured to generate a first message, where the first message carries ACK/NACK information and layer information, where the layer information is used to indicate a layer determined by the terminal, and the sending module is configured to send the first message. Reporting the layer information together with the ACK/NACK information can reduce unnecessary signaling overhead.

Alternatively, the ACK/NACK information and the layer information may be obtained by joint coding to obtain a bit string representation. The ACK/NACK information may indicate an ACK or a NACK. Layer information may indicate one or more layers in a layer set. The layer set includes one or more layers that can be reported. Thus, there are various combinations between ACK/NACK information and layer information. For example, NACK and layer 0 can be a combination, NACK and layer 1 can be another combination, and so on. These combinations can be represented by a single bit string. Thus, a bit string in which ACK/NACK information and layer information are jointly encoded can be obtained. The bit string obtained by joint coding indicates that the ACK/NACK information and the layer information can reduce the overhead as compared with the number of bits required to indicate ACK/NACK information and layer information respectively. In a specific implementation, there is a storage unit or memory in the terminal or access device to store a correspondence table between the bit string and the different combinations.

Optionally, the number of layers indicated by the layer information is 2. This is equivalent to the first message carrying ACK/NACK information and layer information indicating two layers. It is also possible to represent the combination of the ACK/NACK information and the layer information indicating the layer information of the two layers. For example, bit string 0001 represents NACK, layer 0, and layer 1.

Since there are many combinations of ACK/NACK information and layer information, there are also multiple bit strings obtained by joint coding. For example, the bit string obtained by the joint coding may be a first bit string or a second bit string; wherein the first bit string is used to indicate an ACK, and the second bit string is used to indicate one or more determined by the NACK and the terminal. Layers.

Alternatively, when the number of layer sets available for the candidate as the layer to be reported is large (for example, 6 layers or 8 layers), the number of elements in the layer set of the reported layer may be limited. By limiting the number of elements of a set of layers that can be reported, the number of bits required to report a layer can be reduced, thereby reducing overhead.

It should be noted that the joint coding in the embodiment of the present application mainly refers to combining layer information to be transmitted with other information and referring to the bit string. In this way, as long as the bit string is transmitted, the corresponding layer information and other information can be transmitted.

Optionally, the sending module of the terminal is further configured to send a second message, where the second message carries indication information, where the indication information is used to indicate whether the configuration of the layer corresponding to the phase tracking reference signal PTRS port of the terminal is appropriate, or is used for requesting Report layer information. Usually, the indication information can be represented by 1 bit. Thereby, a low overhead of 1 bit can be maintained without modifying the layer corresponding to the PTRS port.

Before generating the first message, the terminal may determine whether to report the layer information according to the reporting condition. Among them, the reporting conditions include the following situations. Case 1, whether the high-level signaling configuration reports the layer information. Case 2: Whether the high-level signaling configuration can exist PTRS, and if the high-level signaling is configured with PTRS, whether the scheduled MCS is greater than or equal to the MCS threshold of the PTRS and whether the scheduled bandwidth is greater than or equal to the scheduling bandwidth threshold of the PTRS. Case 3: Whether the status of the currently transmitted data is NACK. Case 4: Whether the uplink transmission resource is sufficient for transport layer information. When the above situation is YES, the terminal may determine the reporting layer information, otherwise the reporting layer information is not reported. When the reporting is triggered by the reporting condition, the frequency of reporting can be greatly reduced, which reduces unnecessary reporting, reduces reporting overhead, and reduces resource waste.

The features or concepts related to the first aspect or related to the first aspect of the method, apparatus or device provided by the embodiments of the present application can be obtained by referring to the first aspect. In order to reduce redundancy, in the following aspects, The same or corresponding content is no longer described.

In a second aspect, an embodiment of the present application provides an access device. The access device includes: a receiving module, configured to receive, by the terminal, a first message, where the first message carries ACK/NACK information and layer information, where the layer information is used to indicate a layer determined by the terminal; and the processing module is configured to The phase of the information configuration terminal is the layer corresponding to the PTRS port of the reference signal.

Alternatively, the ACK/NACK information and the layer information may be obtained by joint coding to obtain a bit string representation. The ACK/NACK information may indicate an ACK or a NACK. Layer information may indicate one or more layers in a layer set. The layer set includes one or more layers that can be reported. Thus, there are various combinations between ACK/NACK information and layer information. For example, NACK and layer 0 can be a combination, NACK and layer 1 can be another combination, and so on. These combinations can be represented by a single bit string. Thus, a bit string in which ACK/NACK information and layer information are jointly encoded can be obtained. The bit string obtained by joint coding indicates that the ACK/NACK information and the layer information can reduce the overhead as compared with the number of bits required to indicate ACK/NACK information and layer information respectively.

Optionally, the receiving module of the access device is further configured to receive, by the terminal, a second message, where the second message carries indication information, where the indication information is used to indicate a layer corresponding to the phase tracking reference signal PTRS port of the terminal. Whether the configuration is appropriate or used to request reporting layer information.

In a third aspect, an embodiment of the present application provides a method for reporting layer information. The method includes: generating a first message, the first message carrying ACK/NACK information and layer information, wherein the layer information is used to indicate a layer determined by the terminal; and the first message is sent. Wherein, the ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.

In a fourth aspect, an embodiment of the present application provides a method for processing layer information. The method includes: receiving, by a terminal, a first message, where the first message carries ACK/NACK information and layer information, where the layer information is used to indicate a layer determined by the terminal; and the phase tracking reference signal of the terminal is configured according to the layer information. The layer corresponding to the PTRS port. Wherein, the ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.

In a fifth aspect, an embodiment of the present application provides a method for reporting layer information. The method includes: generating a first message, the first message carrying layer information, the layer information indicating different layers in a case of different DMRS port grouping; sending the first message. Generally, for one DMRS port group to report layer information of one layer, multiple DMRS port groups report layer information of multiple layers. The layer information of the plurality of layers can be represented by a bit string. For a certain bit string, such as 0000, it indicates a different layer in the case of different DMRS port groupings. For example, 0000 refers to Layer 0 and Layer 2 in the case of the first DMRS port grouping and Layer 0 and Layer 4 in the case of the second DMRS Port grouping. Since the access device and the terminal both know the group information between the DMRS port groups, the inter-layer joint coding mode is adopted, which can reduce the number of bits required for reporting multiple layers and reduce the overhead. In addition, the number of DMRS ports in the DMRS port group obtained by DMRS port grouping is usually an even number. In this way, it is possible to exclude a grouping situation in which the number of DMRS ports in a group is an odd number. This can reduce the number of bits representing layer information. In a specific implementation, there is a storage unit or memory in the terminal or access device to store a correspondence table between the bit strings and their different layers in the case of different DMRS port groupings.

In a sixth aspect, an embodiment of the present application provides a method for receiving layer information. The method includes: the access device receives a first message sent by the terminal, where the first message carries layer information, where the layer information indicates different layers in different DMRS port grouping conditions; the access device according to the layer information and the DMRS port of the terminal The grouping information determines the layer reported by the terminal.

In a seventh aspect, a processing device including a transceiving function is provided, and the device may be a terminal or a chip in the terminal. The device has the function of implementing the method provided by the fifth aspect. This function can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

In a possible design, when the processing device is a terminal, the terminal comprises: a processing unit and a transceiver unit, the processing unit may be, for example, a processor, and the transceiver unit may be, for example, a transceiver, and the transceiver includes RF circuit. Optionally, the terminal further includes a storage unit, which may be, for example, a memory. When the terminal includes a storage unit, the storage unit is configured to store a computer execution instruction, the processing unit is connected to the storage unit, and the processing unit executes a computer execution instruction stored by the storage unit, so that the access network device executes the fifth Aspect method.

In another possible design, when the processing device is a chip in an access network device, the chip includes: a processing unit and a transceiver unit, and the processing unit may be, for example, a processor, and the transceiver unit may be, for example, Input/output interfaces, pins or circuits on the chip. The processing unit may execute computer executed instructions stored by the storage unit to cause the chip within the terminal to perform the method of the above fifth aspect. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the access network device, such as a read-only A read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), and the like.

In an eighth aspect, a processing device including a transceiver function is provided, and the device may be an access device or a chip in the access device. The device has the function of implementing the various methods provided by the sixth aspect. This function can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

In a possible design, when the processing device is an access device, the access device includes: a processing unit and a transceiver unit, and the processing unit may be, for example, a processor, and the transceiver unit may be, for example, a transceiver. The transceiver includes a radio frequency circuit. Optionally, the access device further includes a storage unit, which may be, for example, a memory. When the access device includes a storage unit, the storage unit is configured to store a computer execution instruction, the processing unit is coupled to the storage unit, and the processing unit executes a computer execution instruction stored by the storage unit to cause the access network device to perform the above The method of the sixth aspect.

In another possible design, when the processing device is a chip in an access network device, the chip includes: a processing unit and a transceiver unit, and the processing unit may be, for example, a processor, and the transceiver unit may be, for example, Input/output interfaces, pins or circuits on the chip. The processing unit may execute computer executed instructions stored by the storage unit to cause the chip within the terminal to perform the method of the sixth aspect above. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the access network device, such as a read-only A read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), and the like.

The processor mentioned in any of the above may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above. The program-implemented integrated circuit of the method of the third aspect to the sixth method.

In a ninth aspect, there is provided a computer storage medium having stored therein program code for indicating an instruction to perform the methods of the third to sixth methods.

In a tenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods of the third to sixth methods.

In the embodiment of the present application, the reporting is triggered by the reporting condition, which can greatly reduce the frequency of reporting, thereby reducing unnecessary reporting, reducing reporting overhead, and reducing resource waste. By limiting the number of elements of a set of layers that can be reported, the number of bits required to report a layer can be reduced, thereby reducing overhead. By joint coding, such as joint coding between layers or joint coding with ACK/NACK information, the number of bits required to report a layer or report multiple layers can be reduced, thereby reducing overhead.

DRAWINGS

FIG. 1 is a schematic structural diagram of a wireless communication system applied to an embodiment of the present application.

2 is a schematic diagram of transmission of an access device and a terminal.

FIG. 3 is a schematic diagram of transmission of an access device and a terminal.

FIG. 4 is a schematic diagram of a method for reporting layer information according to an embodiment of the present application.

FIG. 5 is a terminal 500 according to an embodiment of the present application.

FIG. 6 is an access device 600 according to an embodiment of the present application.

FIG. 7 is an apparatus 700 including a transceiver provided by an embodiment of the present application.

Detailed ways

FIG. 1 is a schematic structural diagram of a wireless communication system applied to an embodiment of the present application. As shown in FIG. 1, the wireless communication system includes an access device and at least one terminal (such as terminal 1 and terminal 2 in FIG. 1). The terminal is connected to the access device in a wireless manner, and performs control information or data information transmission with the access device. The terminal can be fixed or mobile. FIG. 1 is only a schematic diagram, and the network system may further include other network devices, such as a wireless relay device or a wireless backhaul device. The embodiment of the present application does not limit the number of access devices and terminals included in the wireless communication system.

The access device is an access device that the terminal accesses to the wireless communication system by using a wireless device, and may be a base station, an evolved base station, a base station in a next-generation communication system, or an access node in a WiFi system.

A terminal may also be called a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), or the like. The terminal can be a mobile phone, a tablet, a computer with wireless transceiver function, and other terminals with wireless transceiver functions.

When the access device and the terminal in FIG. 1 communicate, data transmission is performed at multiple layers. Each layer corresponds to a demodulation reference signal (DMRS) port. Each DMRS port transmits a corresponding DMRS, which is used to estimate the channel experienced by the data transmitted with the reference signal. If there is a code division multiplexing (CDM) relationship between the DMRS ports, the DMRS ports corresponding to the reference signals are considered to be quasi-co-located or quasi-co-located (QCL). The quasi-co-located DMRS ports can form a DMRS port group.

In the wireless communication system shown in FIG. 1, when the access device performs downlink communication with the terminal, one or more phase tracking reference signal (PTRS or PT-RS) ports may be required to transmit the PTRS, and the PTRS is used for the PTRS. A phase change experienced by the data transmitted with the PTRS is estimated. Each PTRS port corresponds to one DMRS port in one DMRS port group. Generally, the DMRS port corresponding to the PTRS port is the DMRS port with the smallest port number in the DMRS port group in which it is located (or the index corresponding to the DMRS port is the smallest). Since a DMRS port also has a corresponding relationship with a layer, a PTRS port also corresponds to one layer.

For example, if the access network device and the terminal transmit at four layers, there are corresponding four DMRS ports. These four DMRS ports can be divided into two DMRS port groups. It is quasi-co-located between DMRS ports in the same port group. These two DMRS port groups correspond to two PTRS ports. Table 1 shows the correspondence between a layer, a DMRS port, and a PTRS port.

Table 1 Correspondence table of a layer, DMRS port, and PTRS port

In Table 1, layer 0 corresponds to DMRS port 0, layer 1 corresponds to DMRS port 1, layer 2 corresponds to DMRS port 2, and layer 3 corresponds to DMRS port 3. The DMRS port 0 and the DMRS port 1 form a DMRS port group. PTRS port 0 corresponds to the DMRS port (ie, DMRS port 0) with the smallest port number in the DMRS port group. DMRS port 2 and DMRS port 3 form another DMRS port group. The PTRS port 1 corresponds to the DMRS port (ie, DMRS port 2) having the smallest port number in the DMRS port group. Therefore, it can be considered that PTRS port 0 corresponds to layer 0, and PTRS port 1 corresponds to layer 2.

The PTRS is used to estimate the phase change of the data transmitted with the PTRS. In order to ensure the estimated performance of the PTRS, the terminal may report one or more layers corresponding to the PTRS port for downlink transmission. The one or more layers have better channel quality. Among them, the better channel quality may include a larger signal to noise ratio SNR, a larger signal to interference and noise ratio SINR, and the like.

As an optional solution, the access device adjusts the precoding matrix corresponding to the DMRS port corresponding to the layer and the smallest DMRS port according to the layer reported by the terminal. This is equivalent to adjusting the port configuration of the DMRS, so that the layer corresponding to the DMRS port with the smallest port number is a layer with better channel quality, and the purpose of mapping the PTRS on the layer with better channel quality is achieved. Therefore, the estimation performance of the PTRS can be ensured, so that the data transmission can be performed better in a communication scenario where the phase noise is relatively bad.

For example, FIG. 2 and FIG. 3 are schematic diagrams of transmissions of an access device and a terminal. As shown in FIG. 2, the access device and the terminal have four layers, which are respectively represented by L0, L1, L2, and L3. Each layer corresponds to one DMRS port, which is represented by DMRS0, DMRS1, DMRS2, and DMRS3, respectively. The DMRS port with the smallest port number corresponds to one PTRS port, and the PTRS port is represented by PTRS0. Each DMRS port has a corresponding precoding matrix, which is represented by P0, P1, P2, and P3, respectively. Generally, when the access device sends data, the SNR of the DMRS with the smallest port number has the highest signal-to-noise ratio (or signal-to-noise ratio) or the best channel quality, such as the signal-to-noise of the L0 of the access device in Figure 2. Than the biggest. After receiving the data sent by the access device, the terminal estimates that the signal to noise ratio of L1 is the largest. The terminal reports L1 to the access device. As shown in FIG. 3, the access device adjusts the precoding matrix of the DMRS port corresponding to the layer to the precoding matrix of L0 according to the layer (L1) reported by the terminal, and adjusts the precoding matrix of the smallest DMRS port to the The precoding matrix of the layer (L1) is such that the adjusted L0', that is, the data of the original L1 layer is still the layer with the largest signal to noise ratio after being transmitted to the terminal, and still corresponds to the smallest DMRS port. In this way, it can be ensured that the PTRS is always transmitted on the layer with the largest signal to noise ratio, thereby ensuring the estimated performance of the PTRS, thereby more effectively performing data transmission.

Therefore, in order to ensure good data transmission, the terminal needs to report information of one or more layers. These layers typically have better channel quality, a larger signal to noise ratio, or a larger signal to interference and noise ratio. However, this can increase system overhead or occupy signaling resources. There is therefore a need for a method of reporting one or more layers of information without increasing overhead or simply increasing overhead.

FIG. 4 is a schematic diagram of a method for reporting layer information according to an embodiment of the present application. As shown in FIG. 4, the method specifically includes the following steps.

Step 401: The terminal generates a first message, where the first message carries layer information. The layer information is used to indicate the layer determined by the terminal, that is, the layer corresponding to the PTRS port desired by the terminal. The terminal may carry the layer information in the first message by joint coding, such as joint coding between layers or joint coding with ACK/NACK. The following describes in detail how the terminal reports layer information by joint coding through an embodiment.

Step 402: The terminal sends a first message to the access device.

Before generating the first message, the terminal may determine whether to report the layer information according to the reporting condition. Among them, the reporting conditions include the following situations.

Case 1, whether the high-level signaling configuration reports the layer information. For example, high layer signaling such as RRC signaling configures whether to report layer information. This layer information is used to indicate the layer recommended by the terminal corresponding to the PTRS port. The terminal determines whether to report the layer information according to the indication of the high layer signaling. If the high-layer letter is configured as the reporting layer information, the terminal reports the layer information to the access device. Otherwise, it will not be reported.

Case 2, high-level signaling configuration whether there is PTRS. If higher layer signaling such as RRC signaling is configured as PTRS, the terminal compares the currently scheduled modulation and coding scheme (MCS) and/or bandwidth with the corresponding MCS threshold and/or bandwidth threshold. If the scheduled MCS is greater than or equal to the MCS threshold of the PTRS (such as the first MCS threshold) and the scheduled bandwidth is greater than or equal to the scheduling bandwidth threshold of the PTRS (such as the first bandwidth threshold), the PTRS exists, otherwise the PTRS does not exist. If the PTRS exists, the terminal reports the layer information, otherwise the layer information is not reported. The MCS threshold, the scheduling bandwidth threshold is configured by the high-level signaling to the terminal, or the default value is pre-agreed by the terminal and the network side. Or based on whether there is PTRS in the currently scheduled data. The terminal determines whether to report the layer information according to whether there is a PTRS in the currently scheduled data. If there is PTRS in the currently scheduled data, the layer information is reported, otherwise it is not reported.

Case 3: Whether the current state of the transmitted data is ACK, that is, whether the current data transmission is correctly transmitted or decoded. If the status of the currently transmitted data is ACK, it will not be reported, otherwise it will be reported. For any data transmission, the terminal verifies that the current transmission is correct based on the check code transmitted together in the data. If yes, the ACK is reported to the access device, otherwise the NACK is reported to the access device. If the access device receives an ACK, it will schedule new data for the terminal; otherwise, retransmit the last data. Therefore, if the status of the current transmission data is ACK, it indicates that the data transmission quality is relatively good, and there is no need to report layer information to indicate a layer with better channel quality. Of course, it is also possible to consider whether to report layer information from the perspective of whether the state of the currently transmitted data is NACK.

Case 4: Whether the uplink transmission resource is sufficient for transport layer information. When the uplink transmission resources are insufficient, the layer information is not reported. The uplink transmission resource may include: a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Sharing Channel (PUSCH).

For case 1, if the high layer signaling is configured as the reporting layer information, the terminal may further determine whether to report the layer information according to whether the PTRS exists in the current scheduling data. If the high-level signaling is not reported, the PTRS is not reported in the current scheduled data.

For case 1 or case 2, the period of reporting layer information may be predefined or configured in higher layer signaling such as RRC signaling. The terminal reports layer information according to a predefined or configured period. Further, when the reporting time determined by the period is met, the terminal may further determine whether there is a PTRS in the currently scheduled data. If yes, report it, otherwise it will not be reported even if the conditions of the period are met.

If the layer information is triggered by the reporting condition, the number of times of reporting can be reduced, and the reporting overhead can be reduced.

If the reporting layer information is determined, the terminal needs to further determine the number of reported layers indicated by the layer information and how the layer information is sent to the access device.

For the number of layers, when there are one or more PTRS ports in the downlink transmission, the number of layers can be the same as the number of PTRS ports. For example, the number of layers indicated by the layer information reported by the terminal is 2. In addition, one DMRS port group corresponds to one PTRS port. The number of layers can be the same as the number of currently scheduled DMRS port groups. For example, when the number of currently scheduled DMRS port groups is 1, the number of layers indicated by the reported layer information is 1. If the number of currently scheduled DMRS port groups is 2, the number of layers indicated by the reported layer information is Is 2.

In the downlink transmission, the reference signals that can be used to measure the channel have a channel state information (CSI) reference signal (CSI-reference signal) and a DMRS. The UCI reported by the CSI and the UCI reported by the ACK/NACK respectively. . Therefore, it can be carried in the UCI reported by the CSI, or can be carried in the UCI reported by the ACK/NACK.

There may be multiple layers for downlink transmission, such as 6 layers or 8 layers. Then 3 bits are needed to refer to one of the 6 or 8 layers. If the number of reported layers is 2, then usually 6 bits are needed to refer to the two layers. For example, Table 2 is a correspondence table between 3 bits and layers. It should be noted that Table 2 is only an example, and there may be other correspondences between layers and 3 bits. As the number of layers increases or decreases, the corresponding number of bits required may also increase or decrease. For example, when there are 4 layers, only 2 bits are needed.

Table 2 Correspondence table between 3-bit information and layers

3比特信息3-bit information	6个层6 layers	8个层8 layers
000000	层0Layer 0	层0Layer 0
001001	层1Layer 1	层1Layer 1
010010	层2Layer 2	层2Layer 2
011011	层3Layer 3	层3Layer 3
100100	层4Layer 4	层4Layer 4
101101	层5Layer 5	层5Layer 5
110110	NANA	层6Layer 6
111111	NANA	层7Layer 7

The reported information may be used to indicate the layer number of the layer corresponding to the PTRS port suggested by the terminal. The layer number may be an absolute layer number, or may be a relative layer number in a layer set corresponding to the PTRS port group of the PTRS port in the Physical Downlink Sharing Channel (PDSCH), or may be a corresponding PTRS port in the PDSCH. The relative layer number of the layer set of the DMRS port group relative to the layer where the PTRS port is located.

When the number of layer sets available for the candidate as the layer to be reported is large (such as 6 layers or 8 layers in Table 2), the number of elements in the layer set of the reported layer can be limited. For example, only the first 4 layers in Table 2 can be selected. When the number of elements in the set of values of the reported layer is limited, the number of bits required to report one of the layers can be reduced. When the number of elements in the layer set is reduced to 4, only two bits are needed to represent the four layers. In addition, the layer number can be either an absolute number or a relative number. For example, the absolute numbers of the eight layers may be 0, 1, 2, ..., 7, which represent the first, second, third, ..., and eight layers, respectively. If layer 2 is the current layer or the layer where the PTRS port is located, the relative number of layers 2-5 may be 0, 1, 2, 3. When limiting the number of elements in a layer set, consider confining elements in the layer set to layers adjacent to the current layer. If the current layer is layer 2, the layer set can be limited to {current layer-1, current layer, current layer+1}, corresponding to layer 1, layer 2, layer 3, respectively.

Limiting the number of layer sets can reduce overhead. In addition, in order to reduce the overhead, the number of bits occupied by the layer information may also be reduced by joint coding. The method of reducing the overhead of the transport layer information by joint coding will be described in detail below.

Embodiment 1

When the access device and the terminal perform data transmission, the terminal needs to feed back ACK/NACK. When the data is correctly received, the ACK is fed back, and when the data is not correctly received, the NACK is fed back. When the data transmission is correct, the current channel quality is considered to be better, or the quality of the layer where the PTRS is located is better, that is, no adjustment is needed. Therefore, the layer information can be jointly encoded with the bits occupied by the ACK/NACK.

For example, if the current data transmission status is ACK, it means that the terminal correctly decodes the transmitted data, and the current PTRS port configuration is suitable, that is, the port configuration information of the PTRS does not need to be modified at this time, or The precoding matrix needs to be adjusted such that the smallest DMRS port number corresponds to the layer with the best signal to noise ratio, or the current PTRS port configuration is considered to be optimal. At this time, the smallest DMRS port number corresponds to the best or better layer of signal to noise ratio (signal to noise ratio). Therefore, there is no need to report layer information at this time. If the current data transmission status is NACK, the report layer information needs to be reported. Combined with this feature, layer information and ACK/NACK can be jointly coded, which reduces the bits required for reporting layer information and reduces overhead.

Specifically, multiple layers can be used to simultaneously represent the reported layer and whether the feedback is ACK or NACK. For example, when the number of jointly coded bits is 2, the correspondence between the 2 bits and the information it refers to can be expressed as Table 3. Among them, Table 5 gives a possible example of 4, and of course there may be other correspondences as long as it utilizes layer information and joint coding with ACK/NACK, which should fall within the scope of the present application.

Table 3 Table of correspondence between 2 bits and the information they refer to

2比特2 bits	例1example 1	例2Example 2	例3Example 3	例4Example 4
0000	NACK,层5NACK, layer 5	NACK,当前层NACK, current layer	NACK,当前层NACK, current layer	NACKNACK
0101	NACK,层6NACK, layer 6	NACK,层5NACK, layer 5	NACK,当前层+1NACK, current layer +1	NACK,当前层NACK, current layer
1010	NACK,层7NACK, layer 7	NACK,层6NACK, layer 6	NACK,当前层+2NACK, current layer +2	NACK,当前层+1NACK, current layer +1
1111	ACKACK	ACKACK	ACKACK	ACKACK

As can be seen from Table 5, since the number of bits is 2, the number of reported layers is at most 3 layers. In the example 1, the specific layer number (such as the absolute layer number 5, 6, 7) can be carried while carrying the NACK. In Example 3, the ACK indicates that the feedback is NACK and the reported layer is the current layer. The 01 indicates that the feedback is NACK and the layer reported is the layer number of the current layer plus a layer referred to.

If the transmission of the ACK/NACK itself requires 1 bit, the purpose of reporting one of the three layers can be achieved by adding one bit, for example, the cases shown in Examples 1 and 3 in Table 3. If the transmission of the ACK/NACK itself requires 2 bits, for example, 00 means NACK, and 11 means ACK. At this time, the remaining two states can complete reporting of one of the two layers, that is, the reporting layer information does not need to add bits. For example, the cases shown in Example 2 and Example 4 in Table 3. Alternatively, the reported layers in Examples 3 and 4 of Table 3 may also be represented by absolute layer numbers.

For example, when the number of jointly coded bits is 3, the correspondence between the 3 bits and the information it refers to can be expressed as Table 4.

Table 4 Table of correspondence between 3 bits and the information they refer to

3比特3 bits	例1example 1	例2Example 2	例3Example 3	例4Example 4
000000	NACK,层0NACK, layer 0	NACK,当前层NACK, current layer	NACK,当前层NACK, current layer	NACKNACK
001001	NACK,层1NACK, layer 1	NACK,层0NACK, layer 0	NACK,当前层+1NACK, current layer +1	NACK,当前层NACK, current layer
010010	NACK,层2NACK, layer 2	NACK,层1NACK, layer 1	NACK,当前层+2NACK, current layer +2	NACK,当前层+1NACK, current layer +1
011011	NACK,层3NACK, layer 3	NACK,层2NACK, layer 2	NACK,当前层+3NACK, current layer +3	NACK,当前层+2NACK, current layer +2
100100	NACK,层4NACK, layer 4	NACK,层3NACK, layer 3	NACK,当前层+4NACK, current layer +4	NACK,当前层+3NACK, current layer +3
101101	NACK,层5NACK, layer 5	NACK,层4NACK, layer 4	NACK,当前层+5NACK, current layer +5	NACK,当前层+4NACK, current layer +4
110110	NACK,层6NACK, layer 6	NACK,层5NACK, layer 5	NACK,当前层+6NACK, current layer +6	NACK,当前层+5NACK, current layer +5
111111	ACKACK	ACKACK	ACKACK	ACKACK

Under this scheme, if the transmission of the ACK/NACK itself requires 1 bit, the purpose of reporting one of the 6 or 7 layers can be achieved by adding two bits. If the transmission of ACK/NACK itself requires 2 bits, such as 00 for NACK and 11 for ACK, adding one bit and the remaining two states in the original bit can complete reporting of one of the six layers. If the transmission of the ACK/NACK itself requires 3 bits, such as 000 for NACK and 111 for ACK, the remaining 6 states can complete reporting of one of the 6 layers, as shown in Example 4 of Table 4.

Embodiment 2

In this embodiment, if the number of reported layers is greater than 1, the overhead of reporting layer information may be reduced by means of inter-layer joint coding. In the downlink transmission, two PTRS ports can be scheduled at the same time. Typically, each PTRS port corresponds to one DMRS port group. At this time, a layer that the terminal considers that the channel quality is good can be reported for each PTRS port. Therefore, the number of layers reported above is 2, and other cases can be similarly obtained.

When the number of reported layers is 2, if the number of DMRS ports is 6, the number of DMRS ports included in the two DMRS port groups corresponding to the two PTRS ports is {G1, G2}, where G1 represents the first DMRS. The number of DMRS ports included in the port group. G2 indicates the number of DMRS ports included in the second DMRS port group. {G1, G2} has the following groupings: {0,6},{6,0},{1,5},{5,1},{2,4},{4,2},{3 , 3}. These grouping information of {G1, G2} is known to the terminal. For example, the access device notifies the terminal by transmitting a transmission configuration indication (TCI) message. Therefore, the terminal can perform joint coding using the condition of known packet information. Table 5 is a correspondence table of multi-bit and DMRS ports. Since the DMRS port has a corresponding relationship with the layer, the DMRS port in Table 5 can be replaced with the corresponding layer. At this time, a correspondence table of multiple bits and layers can be easily obtained. The following uses the DMRS port as an example.

Table 5 Correspondence table between multi-bit and DMRS ports

Where Gij represents the jth DMRS port of the i-th DMRS port group, and j is the relative number of the DMRS port in the DMRS group. It can be seen from Table 5 that different layer combinations are represented by the same number in different groupings, and it is possible to implement reporting of multiple layers with fewer bits. That is, when there are two DMRS port groups, and each DMRS port group needs to report a suggested layer number, the joint coding method can reduce the number of bits required for reporting the two layers from 6=2*3 to 4.

An optional embodiment, when the DMRS port is grouped as {0, 6} or {6, 0}, the equivalent of 6 DMRS ports are in one group, and this is equivalent to only one DMRS port group, and only Report a DMRS port or layer.

In another optional embodiment, when the DMRS port group is {1, 5} or {5, 1}, there is only one DMRS port in the DMRS port group, that is, the DMRS port group having only one DMRS port. The downlink transport layer corresponding to the proposed PTRS is the layer corresponding to the only one DMRS port, so the layer information of the DMRS port group is not reported.

In an optional embodiment, considering that the DMRS port of the CDM is QCL, and the DMRS port in the DMRS port group is QCL, the DMRS port of the CDM can be considered as the same DMRS port group. Because the number of DMRS ports of the CDM is 2 or 4, the number of DMRS ports included in the port group of the DMRS is 2 or 4, or the number of ports included in the DMRS port group is even, then {3, 3} can be excluded. Grouping. Therefore, the number of bits required to report two layers can be further reduced to three, which is the same as the number of bits required to report a layer.

Similar joint coding can be done when the number of DMRS ports that are extended to CSI or can be scheduled in one time slot simultaneously with PTRS is 8. For example, when the number of DMRS ports is 8, the number of bits required when the packet is {3, 5} or {5, 3} is the most, which is 5 bits. In other cases, only 3 bits are required (such as the case of {8, 0}, {0, 8}, {7, 1}, {1, 7}) or 4 bits (such as the group {6, 2}, In the case of {2,6}, {4,4}, it is possible to complete the reporting of the two layer numbers. When the number of the report layer is two, the number of bits can be reduced from 6=2*3 to 5, compared to each layer being reported separately. Similarly, if the number of ports included in the DMRS port group is considered to be even, the grouping of {1, 7} or {7, 1} can be excluded, further reducing the number of bits required to report the two layers to 4.

Another method of reporting layer information can be obtained by the example in which the number of layers reported above is two. The method includes: generating a first message, the first message carrying layer information, the layer information indicating different layers in a case of different DMRS port grouping; sending the first message. Generally, for one DMRS port group to report layer information of one layer, multiple DMRS port groups report layer information of multiple layers. The layer information of the plurality of layers can be represented by a bit string. For a certain bit string, such as 0000, it indicates a different layer in the case of different DMRS port groupings. For example, 0000 refers to Layer 0 and Layer 2 in the case of the first DMRS port grouping and Layer 0 and Layer 4 in the case of the second DMRS Port grouping. Since the access device and the terminal both know the group information between the DMRS port groups, the inter-layer joint coding mode is adopted, which can reduce the number of bits required for reporting multiple layers and reduce the overhead. In addition, the number of DMRS ports in the DMRS port group obtained by DMRS port grouping is usually an even number. In this way, it is possible to exclude the grouping situation in which the number of DMRS ports in a group is an odd number. This can reduce the number of bits representing layer information. In a specific implementation, there is a storage unit or memory in the terminal or access device to store a correspondence table between the bit strings and their different layers in the case of different DMRS port groupings.

By using the access device and the terminal, the packet information between the DMRS port groups is known, and the inter-layer joint coding is used to reduce the number of bits required for reporting the two layers and reduce the overhead. When the number of reported layers is 2, at least the overhead of 1 bit can be reduced.

Embodiment 3

Before reporting the layer information, the indication information may be fed back to the access device. Specifically, the indication information is used to indicate whether the configuration of the layer corresponding to the PTRS port of the terminal is suitable; or the indication information is used to indicate whether the layer corresponding to the PTRS port is a layer required by the terminal; or the indication information is used for requesting reporting Layer information. Optionally, the indication information is carried in the signaling of 1 bit. When the access device receives the indication information, and determines that the layer corresponding to the PTRS port in the PDSCH is not the layer required by the terminal, or determines that the terminal requests the reporting layer information, the access device may configure the terminal to report the layer information according to other schemes in the present invention. . Further, the indication information can be fed back simultaneously with the ACK/NACK by means of joint coding. This scheme can maintain a low overhead of 1 bit without modifying the layer corresponding to the PTRS port.

In the embodiment of the present application, the reporting is triggered by the reporting condition, which can greatly reduce the frequency of reporting, thereby reducing unnecessary reporting, reducing reporting overhead, and reducing resource waste. By limiting the number of elements of a set of layers that can be reported, the number of bits required to report a layer can be reduced, thereby reducing overhead. By joint coding, such as joint coding between layers or joint coding with ACK/NACK, the number of bits required to report a layer or report multiple layers can be reduced, thereby reducing overhead.

The method of the embodiment of the present application is described in detail above, and the terminal and the access device involved in the foregoing embodiment are described below. Meanwhile, the embodiment of the present application further provides other devices that can implement the above method.

FIG. 5 is a terminal 500 according to an embodiment of the present application. The terminal 500 includes: a generating module 510, configured to generate a first message, where the first message carries ACK/NACK information and layer information, where the layer information is used to indicate a layer determined by the terminal, and the sending module 520 is configured to send the first Message. Reporting the layer information together with the ACK/NACK information can reduce unnecessary signaling overhead.

Before generating the first message, the terminal may determine whether to report the layer information according to the reporting condition. Among them, the reporting conditions include the following situations. Case 1, whether the high-level signaling configuration reports the layer information. Case 2, high-level signaling configuration whether there is PTRS. Case 3: Whether the status of the currently transmitted data is NACK. Case 4: Whether the uplink transmission resource is sufficient for transport layer information. When the above situation is YES, the terminal may determine the reporting layer information, otherwise the reporting layer information is not reported. When the reporting is triggered by the reporting condition, the frequency of reporting can be greatly reduced, which reduces unnecessary reporting, reduces reporting overhead, and reduces resource waste.

FIG. 6 is an access device 600 according to an embodiment of the present application. The access device 600 includes: a receiving module 610, configured to receive, by the terminal, a first message, where the first message carries ACK/NACK information and layer information, where the layer information is used to indicate a layer determined by the terminal, and the processing module 620 is configured to: The layer corresponding to the phase tracking reference signal PTRS port of the terminal is configured according to the layer information.

It should be understood that the terminal 500 can have any of the functions of the terminals in the above method embodiments. The access device 600 can have any of the functions of the terminals in the above method embodiments. The foregoing and other management operations and/or functions of the respective modules of the terminal 500 or the access device 600 are respectively omitted in order to implement the corresponding steps of the foregoing various methods.

FIG. 7 is an apparatus 700 including a transceiver provided by an embodiment of the present application. A transceiver 710, a processor 720 and a memory 730 are included. The memory 730 can be used to store indication information, and can also be used to store code, instructions, and the like executed by the processor 720. The transceiver 710 can include a radio frequency circuit.

Alternatively, device 700 can be a terminal. The sending module 520 in the embodiment of the present application may be implemented by the transceiver 710, and the generating module 510 may be implemented by the processor 720. Device 700 can also be an access device. The receiving module 610 in the embodiment of the present application may be implemented by the transceiver 710, and the processing module 620 may be implemented by the processor 720.

The embodiment of the present application further provides a chip that implements the method described in the foregoing embodiment. The chip includes a processing circuit and a transceiver circuit. The transceiver circuit can be, for example, an input/output interface, a pin or a circuit, or the like. The processing circuit can execute computer executed instructions stored by the memory unit. The chip may also include a memory unit. The storage unit may be a register, a cache, or the like. Of course, it is also possible to provide an additional memory unit for the chip. For example, the storage unit may also be a storage unit located outside the chip in the terminal or the access device, such as a read-only memory (ROM) or other type of static storage device that can store static information and instructions. Random access memory (RAM), etc.

The embodiment of the present application also provides a communication system. The communication system includes: a terminal box access device that can implement the above method. For example, the communication system includes the terminal 500 in the embodiment shown in FIG. 5 and the access device 600 shown in FIG. 6.

The embodiment of the present application further provides a computer storage medium, which can store program instructions for indicating any of the above methods.

The embodiment of the present application further provides a computer program product comprising instructions, which when executed on a computer, cause the computer to execute the method of the above embodiment.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A terminal, wherein the terminal is used for reporting layer information, and the terminal includes:

a generating module, configured to generate a first message, where the first message carries ACK/NACK information and the layer information, where the layer information is used to indicate a layer determined by the terminal;

And a sending module, configured to send the first message.
The terminal of claim 1 wherein:

The ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.
The terminal of claim 2, wherein

The bit string obtained by the joint coding is a first bit string or a second bit string;

The first bit string is used to indicate an ACK, and the second bit string is used to indicate a NACK and a layer determined by the terminal.
The terminal of claim 1 wherein:

The sending module is further configured to send a second message, where the second message carries indication information, where the indication information is used to indicate whether a configuration of a layer corresponding to a phase tracking reference signal PTRS port of the terminal is appropriate, or is used for Request report layer information.
The terminal according to claim 1, wherein the number of layers indicated by the layer information is 2.
An access device, where the access device includes:

a receiving module, configured to receive, by the terminal, a first message, where the first message carries ACK/NACK information and the layer information, where the layer information is used to indicate a layer determined by the terminal;

And a processing module, configured to configure, according to the layer information, a layer corresponding to a phase tracking reference signal PTRS port of the terminal.
The access device of claim 6 wherein:

The ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.
The access device of claim 7 wherein:

The bit string obtained by the joint coding is a first bit string or a second bit string;

The first bit string is used to indicate an ACK, and the second bit string is used to indicate a NACK and a layer determined by the terminal.
The access device of claim 6 wherein:

The receiving module is further configured to receive a second message, where the second message carries indication information, where the indication information is used to indicate whether a configuration of a layer corresponding to a phase tracking reference signal PTRS port of the terminal is appropriate, or is used for Request report layer information.
The access device according to claim 6, wherein the number of layers indicated by the layer information is 2.
A method for reporting layer information, the method comprising:

Generating a first message, where the first message carries ACK/NACK information and the layer information, where the layer information is used to indicate a layer determined by the terminal;

Sending the first message.
The method of claim 11 wherein

The ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.
The method of claim 12 wherein:

The bit string obtained by the joint coding is a first bit string or a second bit string;

The first bit string is used to indicate an ACK, and the second bit string is used to indicate a NACK and a layer determined by the terminal.
The method of claim 11 wherein the method further comprises:

Sending a second message, where the second message carries indication information, where the indication information is used to indicate whether the configuration of the layer corresponding to the phase tracking reference signal PTRS port of the terminal is suitable, or is used to request reporting layer information.
The method according to claim 11, wherein the number of layers indicated by the layer information is two.
A method of processing layer information, the method comprising:

Receiving, by the terminal, a first message, where the first message carries ACK/NACK information and the layer information, where the layer information is used to indicate a layer determined by the terminal;

And configuring a layer corresponding to the phase tracking reference signal PTRS port of the terminal according to the layer information.
The method of claim 16 wherein:

The ACK/NACK information and the layer information are obtained by joint coding to obtain a bit string representation.
The method of claim 17 wherein:

The bit string obtained by the joint coding is a first bit string or a second bit string;

The first bit string is used to indicate an ACK, and the second bit string is used to indicate a NACK and a layer determined by the terminal.
The method of claim 16 wherein said method comprises:

The second message is received from the terminal, where the second message carries indication information, where the indication information is used to indicate whether the configuration of the layer corresponding to the phase tracking reference signal PTRS port of the terminal is suitable, or is used to request the reporting layer information.
The method according to claim 16, wherein the number of layers indicated by the layer information is two.
A method for reporting layer information, the method comprising:

Generating a first message, where the first message carries layer information, where the layer information indicates different layers in different DMRS port grouping situations;

Send the first message.
A method for receiving layer information, the method comprising:

The access device receives the first message sent by the terminal, where the first message carries layer information, where the layer information indicates different layers in different DMRS port grouping situations;

The access device determines the layer reported by the terminal according to the layer information and the grouping information of the DMRS port of the terminal.
A processing device comprising a transceiving function, characterized in that it has the function of implementing the method as claimed in claim 21.
The method of claim 23 wherein:

When the processing device is a terminal, the terminal includes: a processing unit and a transceiver unit, the processing unit processor, and the transceiver unit is a transceiver.
The method of claim 24 wherein

The terminal further includes a storage unit configured to store a computer execution instruction, the processing unit is coupled to the storage unit, and the processing unit executes a computer execution instruction stored by the storage unit to cause the connection The device is implemented to perform the method of claim 21.
The method of claim 23 wherein:

When the processing device is a chip in an access device, the chip includes: a processing unit and a transceiver unit, the processing unit is a processor, and the transceiver unit is an input/output interface and a pin on the chip. Or circuitry, the processing unit executing computer executed instructions stored by the storage unit to cause the chip within the terminal to perform the method of claim 21.
A processing device comprising a transceiving function, characterized in that it has the function of implementing the method as claimed in claim 22.
The method of claim 26, wherein

When the processing device is an access device, the access device includes: a processing unit and a transceiver unit, the processing unit is a processor, and the transceiver unit is a transceiver.
The method of claim 26, wherein

The access device further includes a storage unit for storing a computer to execute an instruction, the processing unit is connected to the storage unit, and the processing unit executes a computer execution instruction stored by the storage unit to make the The access network device performs the method of claim 22.
The method of claim 26, wherein

When the processing device is a chip in an access network device, the chip includes: a processing unit and a transceiver unit, the processing unit is a processor, and the transceiver unit is an input/output interface and a tube on the chip. A foot or circuit, the processing unit executing computer executed instructions stored by the memory unit to cause the chip within the terminal to perform the method of claim 22.
A computer storage medium, characterized in that the computer storage medium stores program code for indicating an instruction to perform the method of any one of claims 11-22.
A computer program product comprising instructions, wherein the computer program product, when run on a computer, causes the computer to perform the method of any of claims 11-22.